I'v used this 150 plan along with my MiFi for about 18 months without a problem. This was the first time I went over the 150 limit and that was only because the WiFi wasn't working. Again as soon as the data plan was upgraded to 2G the WiFi began working. I still say it seems very suspicious.

Laptop is also thru MiFi no apples & oranges here. MiFi 5G leaves a lot of room for both. The $50 5G data plan for the MiFi was saving me the extra $ that i didn't need for the Smart Phone upgrade data plan.

There is no limit on the WiFi, the 150 plan refers to the 3G plan. The data updates for the phone itself are not charged against you. Some apps update data maybe charged against you. I'm pretty sure I don't have or use them. Still thinking it's something is a little suspicious.